var score=[59,66,64,80,78,90,55,37,60,52];
var failScore=[];
for(var i=0;i<score.length;i++){
    if (score[i]<60){
        failScore.push(score[i]);
    }
}
console.log(failScore);
console.log('不及格的人数为:'+failScore.length);